JP2023089704A - Gas leakage repair method - Google Patents

Abstract

To reduce a repair work of gas leakage.SOLUTION: A gas leakage repair method for repairing a plurality of gas leakage locations in which gas passages are continuous to each other, comprises a step of suctioning gas (G) leaked from any of gas leakage locations (S1, S2) to make at least some of the plurality of gas leakage locations (S1, S2) negative pressure, and a step of applying negative pressure to at least some of the plurality of gas leakage locations (S1, S2), and then plugging the negative-pressure gas leakage locations (S1, S2) with a repair material (4).SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a gas leakage repair method for repairing a gas leakage portion when a gas leakage occurs from a gas-insulated device.

When the gas-insulated equipment deteriorates over time, pinholes are formed in the flange portion, the sealing performance of the packing of the flange portion is deteriorated, and cracks occur in the welded portion. If a gas leak is left unattended, the insulating gas in the gas-insulated equipment may be lost, and the insulation performance may deteriorate, leading to functional failure.
For example, a method is disclosed in which a repair material (curable resin) is embedded in the surface of a damaged portion (gas leak) of a pipe, and the repair material is cured to cover the damaged portion and repair the gas leak. (See Patent Document 1, for example).

JP 2008-121878 A

However, in the case where there are multiple gas leak points (mating surfaces of the flange portion, gaps between the flange portion and the connecting member) that are connected to each other, such as the packing of the flange portion, the gas leak points are filled in order. Since the discharge pressure of the gas from the remaining gas leakage point becomes high, it becomes difficult to fill it with the repair material.
In addition, in gas-insulated equipment, if there are a large number of gas leakage points, it is necessary to fill each gas leakage point with a repair material, so the repair work is time-consuming. .

Accordingly, the present invention has been made in view of the above problems, and provides a technique capable of reducing the repair work for gas leaks.

In order to solve the above problems, an aspect according to the present invention is a gas leak repairing method for repairing a plurality of gas leak locations in which gas passages are connected to each other, wherein gas leaking from any of the gas leak locations is sucked. a step of applying negative pressure to at least some of the plurality of gas leakage locations; and after applying negative pressure to at least some of the plurality of gas leakage locations, applying a repair material to the negative pressure gas leakage locations. and a closing step.

Further, the method includes a step of abutting one end of the pipe member against the repair target so as to surround the gas leaking portion to be sucked, and in the step of making the gas leaking portion negative pressure, the gas leaked into the pipe member is removed. a step of applying suction to create a negative pressure inside the tube, and after creating a negative pressure inside the tube, using a curable repair material to cover and fix one end of the tube with the repair target. In the step of plugging the negative pressure gas leak location with the repair material, after plugging the negative pressure gas leak location other than the gas leak location surrounded by the pipe material with the hardening type repair material, the pipe material is closed. It is preferable to close the gas leak site surrounded by with a curable repair material.

Moreover, it is preferable to have a step of temporarily fixing one end of the pipe to the object to be repaired using an ultraviolet curable repair material before the inside of the pipe is made to have a negative pressure.

In the step of temporarily fixing one end of the pipe to the repair object, a part of the periphery of the one end of the pipe is temporarily fixed to the repair object using the ultraviolet curing repair material. preferably.

In addition, when plugging a gas leak location surrounded by the pipe material with a curable repair material, the pipe material is formed from a transparent material, an ultraviolet curable repair material is injected into the interior of the pipe material, and ultraviolet light is applied. It is preferable to irradiate the tubular material from the outside to cure the ultraviolet curable repair material inside the tubular material.

In addition, when plugging a gas leak surrounded by the pipe material with a hardening type repair material, the hardening type repair material is injected at a pressure higher than the discharge pressure of the gas leak, which causes the gas leak. It is preferable to fill the gas leaking portion of the object to be repaired with the curable repair material.

Moreover, it is preferable that one end portion of the tubular member is formed such that the inner wall approaches the outer wall toward the tip.

Also, a step of closing the gas leakage portion surrounded by the pipe material with a hardening repair material, cutting the pipe material to shorten it, and covering and hardening the cut pipe material with the hardening repair material. It is preferable to have a step.

In addition, after the step of covering and curing the cut pipe material with a curable repair material, it is preferable to include a step of further covering and curing the entire cured repair material with a curable repair material.

Moreover, it is preferable to have a step of coating the exposed repair material to protect it after the step of covering the entire cured repair material with a curable repair material and curing the repair material.

According to the aspect of the present invention, repair work for gas leakage can be reduced.

(a) is a perspective view of a connecting portion of a flange portion where the sealing performance of a packing of a gas-insulated device to be subjected to a gas leakage repair method has deteriorated, and (b) is a cross-sectional view along AA in (a), (c) is a BB cross-sectional view in (a). It is a figure explaining the method of temporarily fixing a pipe material to a flange part. It is a figure explaining the method of making the inside of a pipe material into a negative pressure, and fixing a pipe material to a flange part. FIG. 4 is a diagram for explaining a method of injecting a repair material into the inside of a pipe; FIG. 4 is a diagram for explaining a method of curing the repair material injected into the inside of the pipe material; FIG. 10 is a diagram illustrating a method of filling the pipe material with a repair material after cutting the pipe material; FIG. 10 is a diagram for explaining a method of burying a pipe material with a repair material and then burying the pipe material with a repair material. It is a figure explaining the method of forming the protective layer which protects a repair material. FIG. 3 is a cross-sectional view of a cemented portion of a bushing of a gas-insulated device that is a target of the gas leakage repair method; 1 is a perspective view of a pinhole-generated welded portion of a gas-insulated device that is a target of a gas leakage repair method; FIG.

Preferred embodiments of the present invention will be described with reference to the drawings. It should be noted that the embodiment shown below is an example, and various embodiments can be made within the scope of the present invention.

Gas leak repair methods are applied, for example, to joints of flanges in gas-insulated equipment installed in power plants and substations, around connecting members (for example, bolts and nuts) that connect flanges, and cementing of bushings. It is used to repair gas leaks from damaged areas such as cracks and pinholes in the surroundings and flanges. That is, the gas leak repair method is a method suitable for repairing a plurality of gas leak locations where gas passages are connected to each other. Below, at the joint location of the flange portion of the gas-insulated equipment, the packing (seal member) provided on the mating surface of the flange portion is damaged due to deterioration, etc., and the outer circumference of the flange portion and the gap between the connecting member and the flange portion. A method for repairing a gas leak when gas is leaking from (for example, a bolt hole) will be described.

FIG. 1(a) is a perspective view of a connecting portion of the flange portion where the sealing performance of the packing has deteriorated, FIG. 1(b) is a cross-sectional view along AA in FIG. 1(a), and FIG. ) is a cross-sectional view taken along the line BB in FIG. 1(a).
As shown in FIG. 1, a packing (sealing member) 20 is provided on the mating surfaces of the flange portions 1 at the connection portion between the flange portions 1 to prevent the gas in the gas-insulated equipment from leaking to the outside. . When cracks occur in the packing 20 due to aged deterioration, etc., the sealing function deteriorates and gas leaks out from the cracks. Is required. Gas leakage from the packing 20 can be easily found by using a gas leakage detector or applying soapy water. Specifically, the gas G leaking from the packing 20 is released into the gap S1 between the mating surfaces of the flange portion 1 (see FIG. 1B) and between the flange portion 1 and the connecting member 30 (bolts 31 and nuts 32). It is discharged to the outside of the flange portion 1 through the gap S2 (see FIG. 1(c)). That is, the gaps S<b>1 and S<b>2 become gas leakage points of the gas G leaking from the packing 20 of the flange portion 1 .
In the following description, an example will be described in which the leaked gas is sucked from the gap S1 when the gas leak is repaired.

When repairing the gas leakage from the packing 20 in the flange portion 1, the periphery of the gap S1 (the outer peripheral surface of the flange portion 1), which is the location of the gas leakage, is cleaned, and then the gap S1 is removed as shown in FIG. One end of the pipe member 3 is abutted against the outer peripheral surface of the flange portion 1 so as to enclose a part of the area. It is preferable to use, for example, a colorless and transparent acrylic tube formed in a cylindrical shape as the tube member 3 . The reason why the material is colorless and transparent is to allow ultraviolet rays to pass therethrough so as to cure the ultraviolet curable repair material injected into the inside of the tube member 3 . Note that the tube member 3 is not necessarily limited to a colorless and transparent acrylic tube as long as it allows ultraviolet rays to pass therethrough.

One end of the pipe member 3 is formed such that the inner wall approaches the outer wall toward the tip. Specifically, the inner diameter of one end of the pipe member 3 is enlarged so that the inner wall slopes toward the outer wall toward the tip. This is because when the repair material injected into the tube material 3 hardens, the repair material in the enlarged diameter portion 3a functions as a stopper, thereby preventing the hardened repair material from coming out to the other end side of the tube material 3. This is to prevent The height of the enlarged diameter portion 3a is formed to be approximately 3 mm to 5 mm.

After abutting one end of the pipe member 3 against the outer peripheral surface of the flange portion 1 so as to partially surround the gap S1 between the mating surfaces of the flange portion 1, an ultraviolet curable repair material 4 (hereinafter referred to as UV repair material 4) is applied. ) around one end of the pipe member 3 to fill the boundary (gap) between the one end portion of the pipe member 3 and the outer peripheral surface of the flange portion 1 . At this time, the UV repair material 4 is not filled in the entire periphery of the one end of the tube 3, but a part of the periphery of the one end of the tube 3 is filled with the UV repair material 4. - 特許庁This is because, if an attempt is made to fill the entire circumference of one end of the pipe member 3 from the beginning, the discharge pressure of the gas G from the boundary between the one end portion of the pipe member 3 and the outer peripheral surface of the flange portion 1 gradually decreases as the gas leakage point becomes smaller. , so that the work of burying with the UV repair material 4 becomes difficult. In addition, when burying one end of the tube 3 with the UV repair material 4, the surface of the flange part 1 should be covered so that the UV rays to be irradiated later can reach the UV repair material 7 (described later) inside the tube 3 without fail. It is preferable to keep the height at about 3 mm to 5 mm.

The UV repair material 4 may be, for example, one-liquid UV-curing acrylic, but is not limited to this repair material as long as it is a material that cures when irradiated with UV rays. Moreover, the repair material is not limited to the UV repair material 4, and a two-component curable repair material (for example, a two-component epoxy resin or the like) may be used.
Then, the UV repair material 4 is immediately irradiated with ultraviolet rays using an ultraviolet ray irradiator to be cured. As the ultraviolet irradiator, for example, one that emits ultraviolet rays with a wavelength of 365 nm or 405 nm is used. The UV repair material 4 is in a translucent liquid state before curing, and becomes a white solid after curing, so that it is possible to visually confirm whether or not the UV repair material 4 has cured. The UV repairing material 4 immediately hardens, and the curing of the UV repairing material 4 causes the pipe material 3 to stand on the outer peripheral surface of the flange portion 1 . Therefore, at this stage, one end of the pipe member 3 is temporarily fixed to the outer peripheral surface of the flange portion 1 . In this state, the gas G leaked from the packing 20 is not surrounded by the other end portion of the pipe member 3, part of the boundary between the one end portion of the pipe member 3 and the outer peripheral surface of the flange portion 1, and the pipe member 3. It leaks out from the gap S1 and the gap S2.

Next, as shown in FIG. 3, a vacuum pump 6 is connected to the other end of the pipe member 3 via a tube 5 to suck the gas G leaking into the pipe member 3, and the inside of the pipe member 3 and the flange are removed. A gap S1 between the mating surfaces of the portion 1 and a gap S2 between the flange portion 1 and the connecting member 30 (bolts 31 and nuts 32) are set to negative pressure. That is, the suction of the gas G by the vacuum pump 6 creates a negative pressure in the space formed outside the packing 20 in the flange portion 1 . Specifically, the vacuum pump 6 sucks a larger amount of gas than the amount of gas leaking from the packing 20, so that the pressure in the gaps S1 and S2 inside the tube member 3 can be reduced to negative pressure. As a result, the gas G leaking from the packing 20 does not leak outside from the boundary between the flange portion 1 and one end portion of the pipe member 3 and the gaps S1 and S2, and is all concentrated in the pipe member 3, and the vacuum pump 6 is aspirated. The vacuum pump 6 does not need to bring the inside of the tube 3 to a negative pressure close to vacuum in order to prevent the tube 3 from being damaged and the UV repair material 4 from being sucked together with the gas G. The extent to which the negative pressure is applied can be appropriately adjusted according to the size of the flange portion 1, the diameter of the bolt 31, and the discharge pressure of the gas G.

After the inside of the pipe material 3 is made negative pressure by the vacuum pump 6, the UV repair material 4 is used to fill the remaining part of the circumference of one end of the pipe material 3 that is not filled with the UV repair material 4, and the ultraviolet ray is removed. An irradiator is used to irradiate the UV repair material 4 with ultraviolet rays to cure it. As a result, the entire circumference of the one end of the pipe material 3 is filled with the UV repair material 4 , and the one end of the pipe material 3 is completely fixed to the flange portion 1 . Therefore, since the boundary between the flange portion 1 and one end of the pipe member 3 is completely blocked by the UV repair material 4, the gas G leaking from the gap S1 surrounded by the pipe member 3 is does not leak from the inside of the Further, when filling the remaining portion with the UV repair material 4, the UV repair material 4 can be sucked toward one end of the pipe material 3 by negative pressure, so that the periphery of the pipe material 3 can be filled without gaps.

After fixing the pipe member 3 to the flange portion 1, the gap S1 and the gap S2 not surrounded by the pipe member 3 are filled with the UV repair material 4, and the UV repair material 4 is irradiated with ultraviolet rays using an ultraviolet ray irradiator to be cured. . As a result, of the gap S1 and the gap S2 that are not surrounded by the pipe member 3, the part having the negative pressure is blocked. At this time, the repair material is not limited to the UV repair material 4, and a two-component curable repair material (for example, a two-component epoxy resin, etc.) may be used. Here, when the gas G is sucked by the vacuum pump 6 and the entire area of the gaps S1 and S2 is not brought to a negative pressure, only the gas leaking portion which is at a negative pressure is filled with the repair material so that the negative pressure can be created. For the rest of the gas leakage points where there were no gas leaks, it is recommended that the tube material 3 is erected again in the gap S1, and the gas is sucked by the vacuum pump 6, and repaired in the same manner as described above. In other words, the gas leaking from any of the gas leakage points is sucked, at least a part of the plurality of gas leakage points is set to a negative pressure, and the negative pressure gas leak point is closed with the repair material.

Next, as shown in FIG. 4, the interior of the tube 3 is filled with an ultraviolet curable repair material 7 (hereinafter referred to as UV repair material 7). Specifically, the tube 5 and the vacuum pump 6 attached to the other end of the tube 3 are removed, and the syringe 9 is connected to the other end of the tube 3 through the tube 8 .

After connecting the syringe 9 , the UV repair material 7 is injected into the tube 3 from the syringe 9 . By injecting the UV repair material 7 at a pressure equal to or higher than the discharge pressure of the leaking gas G, the UV repair material 7 also enters the gap S1 that causes gas leakage. After injecting the UV repair material 7 to the end, as shown in FIG. The UV repair material 7 inside is irradiated to cure the UV repair material 7 . At this time, only the UV repair material 7 inside the pipe material 3 is irradiated with the ultraviolet rays. Since the pipe member 3 is made of a colorless and transparent acrylic pipe, the ultraviolet rays pass through the pipe member 3 and hit the UV repair material 7. - 特許庁As a result, the UV repair material 7 inside the pipe member 3 and in the gap S1 is cured, so that the gap S1 surrounded by the pipe member 3 is closed.

Since the UV repair material 7 fills not only the inside of the pipe material 3 but also the gap S1, there is no gas accumulation, and the maximum contact area of the UV repair material 7 can be ensured. Further, since the UV repair material 7 in the pipe member 3 and the UV repair material 7 in the gap S1 are integrated, stronger repair is possible. The UV repair material 7 on the enlarged diameter portion 3a of the pipe member 3 serves as a stopper (stopper) that prevents the UV repair material 7 from moving toward the other end portion of the pipe member 3 due to the discharge pressure of the gas that is about to leak out. function, the function of preventing gas leakage can be enhanced.

The UV repair material 7 may be, for example, one-component ultraviolet curing acrylic, like the UV repair material 4, but if it is a material that is cured by ultraviolet irradiation, it is limited to this repair material. isn't it. Furthermore, the repairing material injected into the inside of the pipe member 3 is not limited to the UV repairing material 7, and a two-component curable repairing material (for example, two-component epoxy resin, etc.) may be used. However, when using a two-component repair material, it does not harden immediately, so it is necessary to keep applying pressure to the repair material with the syringe 9 until it hardens so that the repair material is not pushed back by the pressure of the gas. be. In this case, the tube member 3 need not be made of a colorless and transparent material that transmits ultraviolet rays.

After curing the UV repair material 7 inside the tube material 3, the tube 8 and the syringe 9 are removed, and the tube material 3 is cut short while leaving the vicinity of one end of the tube material 3. When cutting the pipe material 3, by using an ultrasonic cutter, the cutting can be performed without applying an excessive load to the cured UV repair material 7. FIG. After cutting the pipe material 3, a part of the pipe material 3 is exposed from the UV repair material 4. - 特許庁

Next, as shown in FIG. 6, a part of the tube material 3 exposed from the UV repair material 4 is buried with an ultraviolet curing repair material 10 (hereinafter referred to as the UV repair material 10), and an ultraviolet irradiator L is used. The UV repair material 10 is irradiated with ultraviolet rays to be cured. As a result, the pipe member 3 is completely covered with the UV repair materials 4 and 10. As shown in FIG. The UV repair material 10 may be the same material as the UV repair materials 4 and 7, or a two-component curable repair material (for example, two-component epoxy resin, etc.) may be used instead of the UV repair material 10. .

Next, as shown in FIG. 7, the entirety of the UV repair materials 4 and 10 covering the pipe material 3 is filled with an ultraviolet curing repair material 11 (hereinafter referred to as UV repair material 11), and the ultraviolet irradiator L is turned on. The UV repair material 11 is irradiated with ultraviolet rays using the UV repair material 11 to be cured. As a result, the pipe material 3 is further reinforced by the UV repair material 11 . Here, the UV repair material 11 is embedded so as to completely cover the entire UV repair materials 4 and 10 so as to secure a radius of at least 20 mm or more from the gap S1. As a result, the final surface finishing of the repaired portion can be performed, and the wall thickness and contact area for increasing the strength can be secured. The UV repair material 11 may be the same material as the UV repair materials 4, 7 and 10, or instead of the UV repair material 11, a two-component curable repair material (for example, two-component epoxy resin, etc.) may be used. good too.

Next, as shown in FIG. 8, coating is applied to protect the UV repair material 11 exposed to the outside. Specifically, in consideration of weather resistance over a long period of time, the protective coating is applied in multiple steps for the purpose of UV protection to form the protective layers 12 and 13 . The reason why the protective coating is applied in a plurality of times is to suppress the influence on the UV repair material 11 as much as possible by applying one protective coating in thin layers and drying immediately. The protective layers 12 and 13 are not limited to two layers, and two or more layers may be formed. Moreover, each of the protective layers 12 and 13 may be formed of the same material, or may be formed of different materials.

According to the gas leakage repair method as described above, the space formed outside the packing 20 in the flange portion 1 by applying negative pressure to the gaps S1 and S2, which are locations where gas leaks from the packing 20 of the flange portion 1. The gas G leaking inside can be collected at the suction point (vacuum pump 6). As a result, it is structurally possible to collect the gas G leaking over a wide area and repair it while preventing gas leaks from other places, so it is necessary to fill in the repair material for each gas leak location. is eliminated, and repair work for gas leaks can be reduced. In addition, as a procedure for repairing a gas leak, since the gas G is sucked and the concentrated portion is closed last, most of the gas leak portion can be repaired with a negative pressure, and the gas leak portion can be repaired. Work can be reduced.
In addition, one end of the pipe member 3 is abutted against an object to be repaired such as the flange portion 1 so as to surround the gaps S1 and S2, which are gas leakage locations, and the leaked gas G is sucked into the pipe member 3. By applying a negative pressure to the gas leaking point near the gas leaking point against which the pipe member 3 abuts, the gas leaking point can also be reduced to a negative pressure. Therefore, even if the gas leakage point exists in a wide area, as the gas leakage point is covered in order as in the conventional method, the discharge pressure of the gas G from the remaining gas leakage point increases, and the repair is performed. It is possible to easily fill the gas leakage point with negative pressure with the repair material without the problem of difficulty in covering it with the material. Moreover, by using the pipe material 3, the leaked gas G can be easily collected.
Therefore, the repair work for the gas leaking portion can be reduced, and the repairing work for the gas leaking portion can be completed in a short time, so that the amount of gas leakage can be reduced, and the gas replenishment time for compensating for the leaked gas G can be obtained. can be shortened.

<Others>
Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and includes all aspects included in the concept of the present invention and the scope of claims. Moreover, each configuration may be selectively combined as appropriate so as to achieve at least part of the above-described problems and effects.
For example, in the gas leak repair method described above, the location where the pipe member 3 is erected to suck the leaked gas G is not limited to the gap S1 between the mating surfaces of the flange portion 1. It may be a gap S2 between the portion 1 and the connecting member 30 (bolt 31, nut 32).
Further, the method is not limited to the method of fixing the pipe member 3 so as to surround part of the gaps S1 and S2 and sucking the gas G in the pipe member 3 to make the gaps S1 and S2 negative pressure. etc. may be brought close to each other to suck the leaking gas G, and the gaps S1 and S2 may be set to a negative pressure.

The gas leak repair method can be applied to, for example, repair of a gas leak from a cemented portion of a bushing in gas-insulated equipment, as shown in FIG. Specifically, in the bushing, a metal tank 91 and a porcelain insulator 92 are sealed by a gasket 93 , and the tank 91 and the insulator 92 are joined by a cementing portion 94 outside the gasket 93 . there is
In such a structure, if the gasket 93 is damaged due to aged deterioration or the like, the gas G in the tank 91 leaks out from the gasket 93, and furthermore, the cementing portion 94 formed of a porous material, the tank 91 and the connecting member 95 are damaged. may leak from the gap S3 between the In such a case, by sucking the gas G from the cementing portion 94 to create a negative pressure, the gas G leaking into the space formed outside the gasket 93 can be collected at the suction portion (vacuum pump 6). Because of the structure, the gas G leaking over a wide area can be repaired in a concentrated state, so the repair work for the gas leak can be reduced.

The gas leak repair method can also be applied to, for example, repair of a welded portion 17 between a flange portion 15 and a pipe 16 in which pinholes 14a, 14b, 14c are generated in gas-insulated equipment, as shown in FIG. In this case, by applying a negative pressure to the pinhole 14a surrounded by the broken line, gas will not leak out from the pinholes 14b and 14c existing near the pinhole 14a, so the pinholes 14b and 14c can be easily repaired. can be filled with Therefore, it is not necessary to repair the pinholes 14a, 14b, and 14c while resisting the discharge pressure of the gas, unlike the conventional art, so that the repair work for gas leakage can be reduced.

1 Flange 3 Tubing 3a Expanded diameter 4 UV repair material 5 Tube 6 Vacuum pump 7 UV repair material 8 Tube 9 Syringe 10 UV repair material 11 UV repair material 12 Protective layer 13 Protective layers 14a, 14b, 14c Pinhole 15 Flange 16 Piping 17 Welded portion 20 Packing (seal member)
30 connecting member 31 bolt 32 nut G gas L ultraviolet irradiator S1, S2, S3 gap (gas leakage point)

Claims (10)

A gas leak repair method for repairing a plurality of gas leak locations in which gas passages are connected to each other,
a step of sucking gas leaking from any of the gas leakage locations to make at least part of the plurality of gas leakage locations negative pressure;
a step of closing at least a portion of the plurality of gas leakage locations with a repair material after reducing the pressure to a negative pressure;
A gas leak repair method, comprising: a step of abutting one end of the pipe material against the repair target so as to surround the gas leak to be sucked;
In the step of creating a negative pressure at the gas leakage point, the gas leaking into the tube is sucked to create a negative pressure inside the tube,
A step of covering and fixing one end of the pipe with the object to be repaired using a curable repair material after making the inside of the pipe have a negative pressure;
In the step of plugging the negative pressure gas leak location with the repair material, after plugging the negative pressure gas leak location other than the gas leak location surrounded by the pipe material with the hardening type repair material, the gas leak location is surrounded by the pipe material. 2. The gas leak repairing method according to claim 1, wherein the leaked gas leak is plugged with a hardening repair material. 3. The method according to claim 2, further comprising a step of temporarily fixing one end of the pipe to the object to be repaired using an ultraviolet curable repair material before applying a negative pressure to the inside of the pipe. Gas leak repair method. In the step of temporarily fixing one end of the pipe to the repair object,
4. The method of repairing a gas leak according to claim 3, wherein a portion of the periphery of the one end of the pipe is temporarily fixed to the object to be repaired using the ultraviolet curable repair material. When plugging the gas leakage location surrounded by the pipe material with a hardening repair material,
The pipe member is made of a transparent material, an ultraviolet curing repair material is injected into the pipe member, and ultraviolet rays are irradiated from the outside of the pipe member to cure the ultraviolet curing repair material inside the pipe member. The gas leak repair method according to any one of claims 2 to 4, characterized in that: When plugging the gas leakage location surrounded by the pipe material with a hardening repair material,
The hardening repair material is injected at a pressure equal to or higher than the discharge pressure of the gas leak, and the hardening repair material fills the gas leaking portion of the object to be repaired, which is the cause of the gas leak. The gas leak repair method according to any one of claims 2 to 5. 7. The gas leak repairing method according to any one of claims 2 to 6, wherein the one end of the pipe material is formed such that the inner wall approaches the outer wall toward the tip. After plugging the gas leak location surrounded by the pipe material with a hardening repair material,
cutting and shortening the tubing;
a step of covering and curing the cut pipe material with a curable repair material;
The gas leak repair method according to any one of claims 2 to 7, characterized by comprising: After the step of covering and curing the cut pipe material with a curable repair material,
9. The method of repairing a gas leak according to claim 8, further comprising a step of covering the entire cured repair material with a curable repair material and curing the repair material. After the step of covering the entire cured repair material with a curable repair material and curing,
10. The method of repairing a gas leak according to claim 9, further comprising the step of applying a protective coating to the exposed repair material.

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